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Finding the Fourth Proportional to 99,806.70, 149,710.05 and 90,621.30

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Solution

The fourth proportional to 99,806.70, 149,710.05 and 90,621.30 is: 135,931.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,806.70 : 149,710.05 = 90,621.30 : x
  2. Step 2: Convert to fraction form
    99,806.70/149,710.05 = 90,621.30/x
  3. Step 3: Cross multiply
    99,806.70x = 149,710.05 × 90,621.30
  4. Step 4: Simplify right side
    99,806.70x = 13,566,919,354.07
  5. Step 5: Solve for x
    x = 13,566,919,354.07/99,806.70
  6. Step 6: Final answer
    x = 135,931.95

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.